问pm错误！缺少脚本: build。我尝试构建一个js文件。我有npm库/

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var testFunct = function test(message) { 
    const NodeRSA = require('node-rsa');
    const key = new NodeRSA(); 
    var k = key.generateKeyPair(); 
    var p = k.exportKey('pkcs1'); 
    return p};
console.log(testFunct())

{
  "name": "pol",
  "version": "1.0.0",
  "description": "",
  "main": "a.js",
  "dependencies": {
    "node-rsa": "^1.1.1",
    "build": "webpack a.js b.js"
  },
  "devDependencies": {
    "webpack": "^5.58.2"
  },
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC"
}

module.exports = {
    entry: ['a.js'],
    output: {
      path: './build',
      filename: 'bundle.js'
  
    }
  }